The ZDT (Zhongwen Development Tool) is a program written to help users study Mandarin Chinese. Users can create their own word lists and quiz themselves using three different flashcard modes. There is also a dictionary that can be used to search through the built in CEDICT (and optional Adso) databases. Users can input Chinese characters and get the associated pinyin and English definitions through the Annotation function. This makes it convenient to read blocks of Chinese text. The program is built on top of the Eclipse RCP platform, which allows it to be extendable through its plugin architecture. It runs on Linux, OS X, and Windows platforms.